Imbalance exciter DYNAQ
Controlled and direct transmission of reproducible dynamic forces with frequencies up to 110 Hz into structural components, such as bridges, high-rise buildings, piles, machine foundations, road infrastructure, and track systems as well as into the subsoil – facilitated by Müller-BBM’s imbalance exciter DYNAQ®.
Foundations and buildings
With dynamic measurements the vibrational behaviour of buildings and foundations can be better evaluated. The excitation of DYNAQ® is controlled by both force and vibration – thus it is possible to have a detailed examination of the dynamic stiffness of constructions and, in addition, to analyze the transfer functions of two dynamic systems.
Resonance effects with the constructions’ eigenfrequencies will show up in the course of the dynamic force excitation. Thus, conclusions can be drawn regarding the soil-building-interaction, but also for the impact on individual machines or machine foundations. With the measurement results numerical models can be calibrated and mitigation measures can be effectively dimensioned to reduce distortions or the vibrational transfer.
Adequate knowledge of the dynamic soil parameters is crucial for predicting vibration emissions and the nuisance from vibrations. Parameters such as the dynamic shear modulus and the Poisson’s ratio can be determined e.g. in in-situ measurements by recording the velocities of wave propagation.
With Müller-BBM’s imbalance exciter DYNAQ® frequency-dependent wave fields can be generated in soils.
Through seismic measurements it is possible to allocate depth-depending dynamic parameters, which provide a good understanding of the soil stratification.
DYNAQ®, Müller-BBM’s imbalance exciter, can be used in both tunnel carcasses and in ready-made railway track systems. The dynamic forces that are induced into the superstructure or the substructure with DYNAQ® are in a frequency range between 5 Hz and 110 Hz. Thus, the most relevant frequency range of railway-bound vibration emission is covered.
Recorded response functions of the track system, the tunnel construction or the subsoil can help to make statements not only on stiffness levels, damping properties or impedance values, but also on the characteristic qualities of track insulation measures, such as mass-spring-systems or installed sub-ballast mats.
Vibration measurements with our DYNAQ® imbalance exciter deliver precious data – data that allows predictions regarding track stability at an early stage, before new or retrofitted railway lines are put into operation; this data can even be specified to give insight into the expected shock propagation.